Noah w



(No Model.)

N. W. HOLTV.

ROLLER MILL. No; 263,906. Patented Sept. 5,1882. u

zzaza way:

UNITED STATES NOAH w. Hormon BUFFALO, New-YORK.

PATENT OFFICE.

ROLLER-MILL.

SPECIFICATION formingpart of Letters Patent No. 263,906, dated September5, 1882.

Application mea rune 2, 1882. (No model.)

To all whom it may concern lowing is a specification.

This invention relates more particularly to that class of roller-millswhich are employed for the reduction of grain and similar substances,and has reference to the means for l driving the rollers by an endlessbelt.

The objects of my invention are to avoid theslipping of the endlessbelt'whereby the rollers are driven, to prevent the slow roller fromincreasing its speed by direct or indirect contact with the fast roller,to afford large coutact-surfaees for the endless driving-belt on theroller-pulleys, and to permit the slack ot' the belt tobe readily takenup so as to keepthe belt taut. Y

My invention consists, to that end, of the peculiar improvements in thedriving mechanism which will be hereinafter fully set forth, and pointedout in'the claims.

In the accompanying drawings, `consisting of two sheets,Figure lis aside elevation of my improved driving mechanism. Fig. 2 is a verticalsection in line a: a', Fig. 1. Fig. 3 is a cross-section in line y y,Fig. `1.

Like letters of reference refer to like parts in the several iigures.

, Arepresentsoneot'thestationarysideframes ofthe machine; b, the slowroller; b', the shaft thereof; c, the fast roller, and c the shaftthereof 5 and B C, the journal boxes or bearings in which these shaftsare supported on the side frame, A.

D represents the belt-pulley secured to the shaft b of the slow roller,and E represents the belt-pulleyfwhieh is secured to the shaft c of thefast-roller, and which is smaller in diameter than the pulley D toproduce the llesired diterential speed in the rollers. F represents aguide-pulley arranged about in the same horizontalline with the pulleysD and E.

G represents `a tightener-pulley, which is arranged below the pulleys DE.

g represents an endless drivin g-belt, which runs around the pulleys D,E, F, and G in the direction of the arrow in Fig. 1, the pulleys D,

tal fulerum pin or bolt, i, secured to the side frame, A. The pulley Gis mounted in the upper bit'urcated end of an arm, J, which is shorterthan the arm H, and which swings preferably on the same horizontal pivotor bolt, i, to which the arm H is attached. The lower end of the arm His preferably made hifurcated, and straddles the lower end ot the arm.Jon the bolt c', as represented in Fig. 3. The upper or free end of thearm J is connected with the side t'ranle, A,vby a screw-bolt, k, whichpasses through a lug, l, cast with or secured to the side frame, A. Thescrew-holt lc is provided with a screw-n ut, m, whereby it can be adjusted.

n is a spiral or other suitable spring, which isinterposed between thatportion of the screwboltwhich is attached to the arm J and the portionwhich passes through the lug l, so as to form a yielding or elasticconnection of the arm J with the side frame.

By properly adjusting the screw-bolt 7c the upper end of the arm J ,inwhich the tightenenpulley Gismounted,is drawn dowuward,where by the beltis properly tightened.

The pressure of the belt against the outer portion ot' the pulleyF holdsthe inner side of the pulley F against the pulley E,thereby compellingboth pulleys, E and F, to rotate with the same peripheral speed, wherebythe belt is prevented from slipping and the desired differential speedof the rollers easily maintained.

Power is applied to the shaft c' of the fast roller by means of apulley, O, attached thereto, and a driving-belt, l?, passing around saidpulley, or by any other suitable means.

I claim as my inventionl. The combination, with a pair of' rollers, b c,provided respectively with pulleys D and E, ot' a guide-pulley, F, atightener-pulley, G, and an endless belt, g, running from the pulley Dto the guide-pulley F, thence to the tightener-pulley 1 G, thence to thepulley E, and

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thence to the pulley D, substantiall'y as set forth.

2. The combination, with a pair of rollers,

b o, of the pulleys D and E, mounted on the 5 shafts of said rollers, n.guide-pulley, F, mounted on a. pivoted arm, H, a tightener-pulley, Gr,mounted in a pivoted arm, J, and an endless belt, g, running around saidpulleys, substantially as set forth.

3. Theeombination, with a. pair of rollers,

b c, of the pulleys D and E, mounted on the shafts of said rollers, aguide-pulley, F, a tightener-pulley, G,a.n endless belt, g, and escrewbolt, k, and spring n, whereby the tightenen pulley can beadjusted, substantially as set 15 forth.

NOAH W. HOLT. Witnesses:

GHAs. J. BUGHHEIT, Crus. F. GEYER.

